555 fatigue degree tester circuit

Published:2011/5/24 1:53:00 Author:TaoXi | Keyword: fatigue, degree, tester circuit | From:SeekIC

As the figure 16-26 shows, the astable multivibrator is composed of the 555 and R1，R2，RP1，C1, the oscillation frequency f=1.44/(R1+RP1+2R2)C1. The principle of the fatigue degree tester is based on the visual eye temporarily leave phenomenon of human eyes. The average person under the normal conditions, the eyes can sense the continuous light with the frequency of 30～40Hz. When you are fatigue or drinking too much, the perception frequency will reduce. The figure parameter's oscillation frequency is about 20～60Hz, you can adjust the RP1 to make the frequency of 35Hz, when you are fatigue, the LED will start flashing.



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